It is no longer possible to use the "l"
constraint in MIPS16 asm statements.

+

GCC versions 4.7.0 and 4.7.1 had changes to the C++ standard library
+ which affected the ABI in C++11 mode: a data member was added to
+ std::list changing its size and altering the definitions of
+ some member functions, and std::pair's move constructor was
+ non-trivial which altered the calling convention for functions with
+ std::pair arguments or return types. The ABI incompatibilities
+ have been fixed for GCC version 4.7.2 but as a result C++11 code compiled
+ with GCC 4.7.0 or 4.7.1 may be incompatible with C++11 code compiled with
+ different GCC versions and with C++98/C++03 code compiled with any version.
+

+

More information on porting to GCC 4.7 from previous versions
of GCC can be found in
the porting